ENH: set default pixel type in other applications (color outputs, label outputs,...)

...ions/AppClassification/app/otbFusionOfClassifications.cxx

...cations/AppClassification/app/otbKMeansClassification.cxx

...plications/AppClassification/app/otbSOMClassification.cxx

Modules/Applications/AppImageUtils/app/otbColorMapping.cxx

...ions/AppSegmentation/app/otbHooverCompareSegmentation.cxx

.../Applications/AppSegmentation/app/otbLSMSSegmentation.cxx

...ations/AppSegmentation/app/otbLSMSSmallRegionsMerging.cxx

Modules/Applications/AppSegmentation/app/otbSegmentation.cxx

Modules/Applications/AppStereo/app/otbBlockMatching.cxx